Abstract
In these days, several kinds of global precipitation maps derived from satellite observations have become available. Some of them have resolutions of 1 hour and 0.1 degree, which seem to be good enough to be used for hydrological purposes including flood detection. As a basic research to develop operational flood detection systems by using satellite precipitation maps mainly for developing countries in near future, we conducted river discharge simulations all over Japan by using several precipitation dataset and evaluated the ability of flood detection. The simulation system is based on “Today's Japan” developed by Yoshimura et al. The GSMaP product can detect the precipitation events which caused flood disasters, but the precipitation amount is generally underestimated, consequently the river discharge is not well simulated in many cases. The GSMaP product adjusted by using monthly and 1 degree rain gauge information can be used to detect flood events as well as hourly rain gauge observations. The underestimation in precipitation estimates by the GSMaP product should be physically modified.
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